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Lithium intercalated anatase used in Li-ion batteries has some special features: coexistence of Li-rich and Lipoor phases as well as two possible positions for Li ions in the oxygen tetrahedron. A theoretical description of the compound considering those peculiarities is presented. As shown by the performed symmetry analysis, the intercalation induced lattice deformation can be accompanied by the ordering of antiferroelectric type (internal piezoeffect). In the following step, a qualitativedoi:10.5488/cmp.12.2.249 fatcat:pdfg3lnot5etlnezrhsje3ncz4